netdev - Re: [PATCH RFC] arm64: eBPF JIT compiler

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Message-ID: <CABg9mcv9_bhx3OwJZHuQhy7Bim2E+VOYwfevHDn+jQ4O1ZN+dA@mail.gmail.com>
Date:	Wed, 2 Jul 2014 22:21:14 -0700
From:	Z Lim <zlim.lnx@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Chema Gonzalez <chema@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC] arm64: eBPF JIT compiler

On Wed, Jul 2, 2014 at 9:57 PM, Z Lim <zlim.lnx@...il.com> wrote:
> On Wed, Jul 2, 2014 at 2:28 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
>> On Tue, Jul 1, 2014 at 10:20 PM, Zi Shen Lim <zlim.lnx@...il.com> wrote:
>> Do you really need 'jump by register' then? Regular 'bl' would be much faster.
>
> We'll need BLR to cover all cases. BL instruction can only address
> +/-128MB (28-bits).
>
> BTW, what is the range of "imm" for JMP|CALL? I'm guessing since it's
> s32, so +/-512MB?

Oops... I meant: is it +/-2GB?
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